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A library for incremental automata construction. This artifact contains algorithms for incrementally constructing DFAs (prefix-closed and non-prefix-closed), Mealy machines, and Moore machines from a finite, incrementally growing set of example inputs/outputs.

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/* Copyright (C) 2013-2014 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 * 
 * AutomataLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * AutomataLib is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with AutomataLib; if not, see
 * http://www.gnu.de/documents/lgpl.en.html.
 */
package net.automatalib.incremental.dfa;

import javax.annotation.Nonnull;

/**
 * Tri-state acceptance value.
 * 
 * @author Malte Isberner
 *
 */
public enum Acceptance {
	FALSE { 
		@Override
		public boolean toBoolean() {
			return false;
		}
	},
	TRUE {
		@Override
		public boolean toBoolean() {
			return true;
		}
	},
	DONT_KNOW {
		@Override
		public boolean toBoolean() {
			throw new UnsupportedOperationException();
		}
		@Override
		public boolean conflicts(boolean val) {
			return false;
		}
	};
	
	/**
	 * Retrieves the corresponding acceptance value (either {@link #TRUE} or {@link #FALSE})
	 * for a given boolean value.
	 * @param val the boolean value
	 * @return the corresponding acceptance value
	 */
	@Nonnull
	public static Acceptance fromBoolean(boolean val) {
		return val ? TRUE : FALSE;
	}
	
	public abstract boolean toBoolean();
	
	
	public boolean conflicts(boolean val) {
		return (val != toBoolean());
	}
}